Set: pp::colors
  Set: pp::unicode
Error (line: 4, pos: 15) type mismatch at definition 'a', expected type
    ℤ
Given type:
    Bool
  Assumed: vector
  Assumed: const
vector Bool 10
let a := 10, v1 : vector Bool a := const a ⊤, v2 : vector Bool a := v1 in v2
vector Bool 10
Error (line: 31, pos: 26) type mismatch at definition 'v2', expected type
    vector ℤ a
Given type:
    vector Bool a
  Assumed: foo
  Coercion foo
vector ℤ 10
  Set: lean::pp::coercion
let a := 10, v1 : vector Bool a := const a ⊤, v2 : vector ℤ a := foo v1 in v2